Abstract: Securing data stored in an electronic component test machine which includes a central processor unit provided with storage means, and a local memory connected to the storage means via a transmission bus. At least one file of test vectors is created to perform the component test. Data contained in the file of test vectors is encrypted. The encrypted test vector file is stored in the storage means of the central processor unit. Prior to each test, the encrypted test vector file is loaded into the local memory via the transmission bus, and then the encrypted data of the test vector files is decrypted and stored in the local memory from where it is retrieved so that the test can be performed. While unencrypted data is stored in the local memory component, access to it by the operator is blocked so that sensitive information contained therein remains secure.